1986 – 1987
Irving, Gary
circa 1981
Ware, George
circa 1970
U.S. Soil Conservation Service
circa 1970
U.S. Soil Conservation Service
circa 1970
U.S. Soil Conservation Service
April 1985
Hootman, Rick
circa 1975
Forest Preserve District of DuPage County
circa 1975
Forest Preserve District of DuPage County
1990
Hootman, Rick, Allen, Kimberly
July 24 1989
C. Edward Ware Associates, Inc.
January 22 2003
Christopher B. Burke, Engineering West, Ltd.
May 1985
Kohout, John
September 1984
Kohout, John
October 1994
Nachel, Jim